环状碳纳米卷中的持续电流

Persistent currents in toroidal carbon nanoscrolls

在环状碳纳米卷紧束缚模型的基础上,导出了相应的持续电流表达式,并系统地研究了环状碳纳米卷的几何结构、分离能级、温度及塞曼效应对持续电流的影响。结果表明,环状碳纳米卷内部的持续电流数量级仅为10-7 A,并且随着卷环周长增大而逐渐减小。费米能级附近的能级几乎承载了所有持续电流,而远离的能级贡献非常小。随着温度升高,持续电流急剧减小;且卷环周长越大,受温度影响越明显。对于较强的磁场,考虑塞曼效应后,持续电流出现了新的减小的越变,周期性结构遭到破坏。

Based on the toroidal carbon nanoscrolls tight-binding model,the expressions of persistent currents are derived,and the effects of geometric structure,separation energy level,temperature and Zeeman effect on the persistent current are systematically studied.The results show that the magnitude of the persistent current in the toroidal carbon nanoscrolls is only 10-7 A,and as the circumference of the coil increases,the persistent current will gradually decrease.The states near the Fermi level carries almost all the persistent current,while the far-off states contribute very little.As the temperature rises,the persistent current decreases sharply;the larger the coil,the more obvious the influence of temperature on the persistent current.With the Zeeman effect taken into account,the persistent current changes with a new decrease and the periodic structure is destroyed for a stronger magnetic field.